New thiourea derivatives

ABSTRACT

D R A W I N G New thioureas corresponding to the formula wherein R1 represents halogen or the methyl group, R2 represents C1-C4 alkyl, R3 represents methyl or allyl and R4 represents C2-C5 alkyl, C3-C5 alkenyl, C3-C5 alkynyl or hydroxy- or cyano-substituted alkyl, benzyl, cycloalkyl-alkyl, or tetrahydrofurylalkyl, WHICH ARE USEFUL FOR THE CONTROL OF ARACHNIDA, PARTICULARLY TICKS.

United States Patent [191 Durr et al.

[ Dec. 16, 1975 NEW THIOUREA DERIVATIVES [73] Assignee: Ciba-Geigy Corporation, Ardsley,

221 Filed: July 16, 1973 21 Appl. No.: 379,536

[30] Foreign Application Priority Data July 24, 1972 Switzerland 11003/72 [52] US. Cl 260/552 R; 424/322; 424/302 {51] Int. Cl. C07C 157/02 [58] Field of Search 260/552 R [56] References Cited UNITED STATES PATENTS 2,651,620 12/1950 Hill et al. 260/553 A 2,723,192 11/1955 Todd 3,395,233 7/1968 Duerr et a1 260/552 R 3,801,635 4/1974 Duerr et al 260/552 R FOREIGN PATENTS OR APPLICATIONS 1,555,793 1/1969 France Primary ExaminerJames 0. Thomas, Jr. Assistant ExaminerG. Breitenstein Attorney, Agent, or FirmFrederick l-l. Rabin; Harry Falber [57] ABSTRACT New thioureas corresponding to the formula wherein R, represents halogen or the methyl group, R represents C -C alkyl, R represents methyl or allyl and R represents C C alkyl, C -C: alkenyl, C -C alkynyl or hydroxyor cyano-substituted alkyl, benzyl, cycloalkyl-alkyl, or tetrahydrofurylalkyl, which are useful for the control of arachnida, particularly ticks.

11 Claims, No Drawings NEW TI-IIOUREA DERIVATIVES The present invention relates to new thioureas, to processes for their production, as well as to agents and methods for the control of arachnida by application of the new thioureas as active substances.

The new thioureas correspond to formula I wherein R represents halogen, preferably chlorine or bromine, or the methyl group R represents C -C -alkyl, preferably C -C -alkyl,

R represents methyl or allyl,

R represents C C -alkyl, C C =,-alkenyl, C -C alkynyl, or hydroxyor cyano-substituted alkyl, benzyl, cycloalkyl-alkyl or tetrahydrofuryalkyl.

Alkyl radicals are the methyl, ethyl, n-propyl, isopropyl n-butyl, isobutyl, sec-butyl or tert.-butyl radicals; and in the case of R also the n-pentyl radical and its isomers. These radicals can be substituted by halogen by which is meant fluorine, chlorine, bromine or iodine, preferably fluorine, chlorine or bromine hydroxy or cyano. By alkenyl or alkynyl radicals are meant preferably propenyl, butenyl or propynyl or butynyl radicals, which can be monoor polysubstituted by methyl. To be mentioned as cycloalkyl radicals are the cyclpropyl, cyclobutyl, cyclopentyl and cyclohexyl radicals; such radicals and also the phenyl radical can beoptionally bound by way of a methylene or dimethylene group and can carry as substituents lower alkyl and/or alkoxy radicals by which are meant such radicals having 1 to 3 carbon atoms, or chlorine.

with an amine of formula III in a solvent or diluent which is inert to the reactants. R to R in formulae II and Ill have the meanings given under formula I.

The following example illustrates the aforementioned process. Temperatures are expressed in degrees Centigrade.

Example An amount of 36.6 g of 4-chloro-2-methyl-phenylisothiocyanate is dissolved in ml of benzene and this solution then added to a solution of 20 g of methylisobutylamine in 200 ml of hexane. On subsequent cooling, 52 g of l-methyl-l-isobutyl-3-(2-methyl-4- chlorophenyl)-thiourea crystallises out. The product has a melting point of 9394.

The following thioureas of formula I are obtained in an analogous manner:

-continued R R2 R3 R4 Melting points:

01 CH3 CH3 H2 c1 CH3 C113 CH 122 123 Cl CH CH c11, 77-79 3 C11 C11 C11 C l-l (n) 78-79 CH CH CH3 CH CH,CH(CH 97-98 CH CH CH CH(CHQ)2CH(CHG),, 129-130 C11 CH, CH CH(CH3)CH2CH2CH3 78-80 CH CH3 CH CH(C2H5)2 l06107 CH3 CH CH CH2CH20H 113-115 C11 CH, C11 c l-i l36l38 C11 CH3 CH C,H, n 117-11s CH3 CH3 CH3 C l-Misc) 34 CH3 CH c,1-1, n 808l (311 C11 CH CH3 C H (sec) 7677 CH, CH CH3 C I-l (iso) 75,5-76,5

CH, CH CH -c1-1 121-122,5

R R2 R3 R4 Melting points: lfhlpzcephalus spec. (Z-phase), Rhlprcephalus appen- 35 dzculatus, Rhzpzcephalus evertsz, Boophzlus mlcroplus (1-, g: g3 5:3 if, phase), Boophilus decoloratus and Amblyomma spec.. 3 5 Br CH C11 C;,H-,(iso) l34-l36 The actlon 1s determmed by a brief lmmerslon of Calm") adult ticks and tick larvae in aqueous emulsions of the CH3 CH3 individual active substances. The concentrations of the 0 40 active substances are varied in the tests. An evaluation BY 3 H is made on the basis of a determination of the concen- Br CH3 CH3 cm, (sec) 798l CH3 CH3 1384395 trat1on necessary to effect a 100% destructlon of the test insects. Br CH3 CH3 127428 For the w1dem ng of the range of action, 1t 1s possible to add to the actlve substances of formula I, in addltion to acaricides and insecticides, e.g. also fungicides, bac- F CH CH C 1-1 116 F CH3 cu, "43 1-1 1 tencldes, fung1stat1cs, bacteriostancs and/or nemato- F 3 3 4 9 (s 106 cides. g g! The compounds of formula I can be used on their 01 own or to ether with suitable carriers and/or additives. O I g v e I a F CH3 CH3 38-90 Suitable carriers and additives may be sol1d or liquid,

2 Z and correspond to the substances common in formula- F 1 2 tion practice, such as, e.g. natural and regenerated sub- F CH3 CH3 CH9 (n) a stances, solvents, dispersing agents, wetting agents, ad-

C1-1 o hesives, thickeners, binders and/or fertilisers. F CH3 CH CH 35-137 For application, the compounds of formula I can be CH, C11 processed into the form of dusts, emulsion concen- The thioureas of formula I possess excellent properties for the control of arachnida, and vof all their development stages, occurring as parasites on animals.

The said thioureas can be employed against arachtrates, granulates, dispersions, sprays, or solutions, the formulation of these preparations being effected in a manner commonly known in practice. Also to be mentioned are cattle dips and spray races, in which aqueous preparations are used.

The agents according to the invention are produced in a manner known per se by the intimate mixing and- /or grinding of active substances of formula I with the suitable carriers, optionally with the addition of dispersing agents or solvents which are inert to the active substances. The active substances can be obtained and used in the following preparation forms:

solid preparations: dusts, r

granulates liquid preparations: l

a. water dispersible active substance concentrates? produced by the mixing of the active substanceswith solid carriers: Suitable ;carriers are,:e.g. kaolin, tacum,

bole, loess, chalk, limestone, ground limestone, atta-H pulgite, dolomite, diatomaceous earth, precipitated si licic acid, alkaline-earth silicates, sodium and pom sium aluminum silicates (feldspar and mica), calcium and magnesium sulphates, magnesium oxide, ground synthetic materials, fertilisers suchasv ammonium sul phate, ammonium phosphate, ammonium nitrate, urea, ground vegetable products, such as bran, bark dust, sawdust, ground nutshells, cellulose powder, residues of plant extractions, active charcoal, etc., alone orin admixture with each other.

Granulates can be very easily prepared'by a process in which an active substance of formula I is dissolved in an organic solvent, the solution thus obtained applied to a granulated mineral, e. g. attapulgite, SiO granicalcium, bentonite, etc., and the organic solvent then evaporated off.

It is possible also to produce polymer granulates; in this case the active substances of formula I are mixed with polymerisable compounds (urea/formaldehyde; dicyandiamide/formaldehyde; melamine/formaldehyde, or others); polymerisation is then carefully carried out in a manner which leaves the active substances unaffected, and granulation performed actually during the gel forming process. It is more favourable, however, to impregnate finished porous polymer granules (urea/- formaldehyde, polyacrylonitn'le, polyester and others), having a specific surface area and a favourable predeterminable adsorption/desorption ratio, with the active substances, e.g. in the form of their solutions (in a lowboiling solvent), and to then remove the solvent. Polymer granulates of this kind can be also sprayed in the form of microgranulates, having bulk weights of preferably 300 g/litre to 600 g/litre, with the aid of spray apparatus. Spraying can be carried out over extensive areas of useful plant crops by the use of aeroplanes.

Granulates can also be obtained by the compacting of the carrier material with the active substances and additives, and a subsequent reducing operation.

Moreover, it is possible to add to these mixtures additives stabilising the active substance and/or nonionic, anion-active and cation-active substances which improve, e.g. the adhesiveness of the active substances on plants and parts of plants (adhesives and agglutinants), and/or ensure a better wettability (wetting agents) as well as dispersibility (dispersing agents).

The following substances are, for example, suitable: olein/lime mixture, cellulose derivatives (methyl cellulose, carboxymethyl cellulose), hydroxyethylene glycol ethers of monoalkyl and dialkyl phenols'having 5 to ethylene oxide radicals per molecule and 8 to 9 carbon atoms in the alkyl radical, ligninsulphonic acid, the alkali metal and alkaline-earth metal salts thereof, polyethylene glycol ethers (carbowaxes), fatty alcohol polyglycol ethers having 5 to ethylene oxide radicals per molecule and 8 to 18 carbon atoms in the fatty alcohol moiety, condensation products of ethylene oxide, propylene oxide, polyvinyl-pyrrolidones, polyvinyl al- 6 cohols, condensation products of urea and formaldehyde, as well as latex products.

Watei-dispersible concentrates of :active substances, i.e. wettable powders, pastes and emulsion concentrates, are agents which can be diluted with water to obtain any desired concentration. They consist of active substance, carrier, optionally additives which stal bilise the active substance, surface-active substances, and anti-fdamagents and, optionally, solvents.

The wettable powders and pastesare obtained by the mixing andgrinding of the active substances with dis-.

persing-agents and pulverulent carriers, in suitable devices,- until homogeneity is-obtained. Suitable carriers are, e.g. those previously mentioned in the case of solid preparations. It is advantageous in some cases to use mixtures of different carriers. As dispersing agents-it is possible to use, e.g: condensation products of sulphonated naphthalene and sulphonatednaphthalene derivatives with formaldehyde, condensation products of naphthalene or of naphthalenesulphonic acids with phenol and formaldehyde, as well as alkali, ammonium and alkaline-earth metal salts of 'lignins'ulphonic acid, also alkylarylsulphonates, alkali metal salts and alkaline-earth metal salts of dibutyl naphthalenesulphonic acid, fatty alcohol sulphates such as salts of sulphated hexadecanols, heptadecanols, octadecanols, and salts of sulphated fatty alcohol glycol ethers, the sodium salt of oleyl methyl tauride, ditertiary ethylene glycols, dialkyl dilauryl ammonium chloride, and fatty acid alkalimetal and alkaline-earth metal salts.

Suitable anti-foam agents are, e.g. silicone oils.

The active substances are so mixed, ground, sieved and strained with the above mentioned additives that the solid constituent in the case of wettable poowders has a particle size not exceeding 0.02 to 0.04 mm, and in the case of pastes not exceeding 0.03 mm. For the preparation of emulsion concentrates and pastes, dispersing agents are used such as those mentioned in the preceeding paragraphs, organic solvents and water. Suitable solvents are, e.g. alcohols, benzene, xylene, toluene, dimethylsulphoxide, and mineral oil fractions boiling in the range of 120 to 350C. The solvents must be practically odourless, not toxic to plants and animals and inert to the active substances.

Furthermore, the agents according to the invention can be used in the form of solutions. For this purpose, the active substance, or several active substances, of the general formula I is (or are) dissolved in suitable organic solvents, solvent mixtures or water. As organic solvents, it is possible to use aliphatic and aromatic hydrocarbons, their chlorinated derivatives, alkylnaphthalenes, mineral oils on their own or in admixture with each other.

The content of active substance in the above described agents is between 0.1 and The active substances of formula I can be made up, for example, in the form of the following preparations; the term parts denotes parts by weight:

50 parts of l-n-butyl-l-methyl-3-(2-methyl-4-chlorophenyl)-thiourea, 5 parts of precipitated silicic acid,

3.5 parts of octylphenol polyglycol ether,

1.5 parts of N-alkyl-benzimidazolesulphonate, 0.3 part of oleic acid, and 39.7 parts of kaolin;

600 g of l-sec-butyl-1-methyl-3-(2-methyl-4-chlorophenyl)-thiourea, 50 g of sulphite liquour, 50 g of ethylene glycol, and 480 g of water.

The active substances are very finely ground with the additives in suitable grinding mils (e.g. air-jet mill or sand mill). Suspensions of any desired concentration can be prepared from the above concentrates by dilution with water. Such suspensions are particularly suitable as cattle dips.

We claim: 1. A thioruea of the formula CH a -NH c N\R wherein R represents halogen or methyl,

5. l-Ethyll -methyl-3-( 2-methyl-4-chloropheny])- thiourea.

6. l-n-Propyll -methyl-3-(2-methyl-4-chlorophenyl )-thiourea.

l-lsopropyll -methyl-3-( 2-methyl-4-chlorophenyl )-thiourea.

- 8. l-n- Butyll-methyl-3-( 2-methyl- 4-chlorophen yl thiourea. v

9. l-sec-Butyll-methyl-3-( 2-methyl-4-chlorophenyl)-thiourea. v l0. l-ten.-butyl- 1-methyl-3-( 2-methyl-4-chlorophenyl )-thiourea. I

l l ln-Propyll-methyl-3-( 2-methyl-4-bromophenyl )-thiourea. 

1. A THIORUEA OF THE FORMULA
 2. A thiourea according to claim 1 wherein R1 represents chlorine or bromine and R2 represents ethyl or methyl.
 3. A thiourea according to claim 2 wherein R1 represents Cl and R2 represents CH3.
 4. 1-Isobutyl-1-methyl-3-(2-methyl-4-chlorophenyl)-thiourea.
 5. 1-Ethyl-1-methyl-3-(2-methyl-4-chlorophenyl)-thiourea.
 6. 1-n-Propyl-1-methyl-3-(2-methyl-4-chlorophenyl)-thiourea.
 7. 1-Isopropyl-1-methyl-3-(2-methyl-4-chlorophenyl)-thiourea.
 8. 1-n-Butyl-1-methyl-3-(2-methyl-4-chlorophenyl)-thiourea.
 9. 1-sec-Butyl-1-methyl-3-(2-methyl-4-chlorophenyl)-thiourea.
 10. 1-tert.-butyl-1-methyl-3-(2-methyl-4-chlorophenyl)-thiourea.
 11. 1-n-Propyl-1-methyl-3-(2-methyl-4-bromophenyl)-thiourea. 